Ocean currents move heat around the planet and set the pace of regional climate. They also carry nutrients that decide where fisheries thrive.

Fun fact: the Antarctic Circumpolar Current moves roughly 137 million cubic metres of water every second.

Want to go deeper into how currents are measured, or how they shape weather on land?

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Ocean Currents, Explained Simply

Ocean Currents, Explained Simply

What Is an Ocean Current?

An ocean current is a steady, directed flow of seawater — a river inside the sea, held on course by wind, heat and the spin of the planet rather than by banks.

What Sets Them Moving?

Surface currents are pushed by prevailing winds and bent by the Earth's rotation. Deeper currents run on density: cold, salty water sinks near the poles, spreads along the sea floor, and rises again thousands of kilometres away. One full loop of that conveyor takes close to 1,000 years.

Key Features

  • Gyres: five basin-wide rotating systems that dominate surface flow, one in each major ocean basin.
  • Upwelling: where wind pulls surface water away from a coast, cold nutrient-rich water rises to replace it and feeds dense fisheries.
  • Thermohaline circulation: the slow, deep overturning driven by differences in temperature and salt rather than wind.

Why Do They Matter?

Currents redistribute roughly a quarter of the heat the tropics receive, which is why Bergen sits under mild winters at the same latitude as southern Greenland.

Fun fact: the Antarctic Circumpolar Current moves roughly 137 million cubic metres of water every second — more than every river on Earth combined.

How Are They Measured?

Drifting floats report position by satellite, moored acoustic profilers read water speed by sonar, and satellite altimeters infer flow from millimetre changes in sea-surface height.